Boiler-tube scraper.



G. J. WRIGHT & B. BELL. BOILER TUBE SGRAPER.

APPLICATION FILED OUT. 10, 1911.

1,040,088. Patented Oct. 1, 1912.

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UNlTEl) STATES PATENT OFFICE.

CHARLES JOHN WEIGHT AND BRITTON BELL, OF KELOWNA, BRITISH COLUMBIA,CANADA.

BOILER-TUBE SCRAPER.

To all whom it may concern:

Be it known that we, CHARLES JOI-IN VRIGHT and BRITTON BELL, subjects ofthe King of Great Britain, residing at Kelowna, in the Province ofBritish Columbia and Dominion of Canada, have invented new and usefulImprovements in Boiler-Tube Scrapers, of which the following is aspecification.

This invention relates to boiler tube cleaners and more particularly tothat type of scrapers which embody a central stem and sprii'igs actuatedto control the opening and closing of the series of bell crank leverswhich carry cleaning or scraping members.

One of the principal objects of the invention is to avoid thedifficulties heretofore encountered in devices of this character, whichconsists in placing the spring for the cutters or scrapers at a point inthe handle where it will not be affected by the heat.

Another object of the invention is to provide means connected to thestem and position adjacent the handle for controlling the position ofthe cutters so that they may be readily inserted or withdrawn from thetube when desired.

Further objects of the invention will appear as the following specificdescription is read in connection with the accompanying drawing, whichforms a part of this application, and in which Figure l is a sideelevation. Fig. 2 is a longitudinal section therethrough.

Referring more particularly to the drawing, 1 represents a tubular headwhich is provided at one end with a plurality of short slots 2 arrangedat quartering intervals around its circumference and at its opposite endwit-h relatively long slots 3 arranged in alinement with the slots 2.Secured in the head, adjacent the outer end thereof, is a bearing block4 and a similar bearing block 5 is slidably mounted in the head. Thesebearing blocks pivotally receive the ends of toggle levers or arms 6which carry suitable scraping cutters 7, as shown. Each part of thetoggle levers has a cutter 7 secured adjacent its joint and each cuttercomprises a body 8 with laterally extending curved arms 9 having acutting edge 10 formed thereon. The cutting edges of the arms arearranged at such an angle that when the toggle levers are clampedagainst the side of the head the ends of the arms Specification ofLetters Patent.

Application filed October 10, 1911.

Patented Oct. 1, 1912.

Serial No. 653,764.

will enter between each other so as to prevent interference and topermit compact folding of said arms. The angle of the cutting edges ofopposite cutters on each arm is parallel and such that in drawing thecleaner through the tube or pushing the same therethrough a shakingaction against the scale will take place, thus making the device easierto operate.

Connected to the head, by means of a reducing coupling 11, is a tubularshank 12 whose opposite end is connected, by means of a reducingcoupling 13 to a tubular handle member 14. The handle member issubstantially the same size as the head member 1 and is connected to thehandle bail 15 across which the handle 16 is secured. The bail 15 isapertured to correspond with the aperture through the tubular handlemember 14: and passing therethrough is a threaded stem 17 which has itsend threaded into the bearing block 5 and has a collar 18 thereonbetween which and the bail is interposed an actuating spring 19. Thisspring normally forces the stem outwardly toward the head 1 and thusexpands the cutters 7. In order to contract the same the stem isprovided with a head having a ban dle 20 extending therethrough which isin position to be engaged by the fore and middle fingers of theoperator, so as to contract the stem against the tension of the springand contract or collapse the toggle members, thereby permitting thedevice to be inserted in or withdrawn from the boiler tube without thecutters acting on the interior surface thereof.

Having thus described the invention, what we claim as new is 1. A deviceof the class described comprising a tubular head, a bearing memberslidably mounted therein, toggle levers pivoted to the bearing memberand to the head and radiating therefrom, scraper members carried by saidlevers, a shank connected to the head, a handle connected to the shank,means slidably and rotatably mounted in the shank and engaging thebearing member for adjusting the separation of the head and bearingmember and means including an operating member arranged adjacent thehandle, and means normally acting on said adjusting means to force thebearing member toward the head and expand the toggle levers.

nected to the threaded rod and located in the handle bail, said handleadapted to 1'0- tate the rod in the bearing member and to slide thebearing member in the tubular head.

In testimony whereof We afiiX our signatures in presence of twoWitnesses.

CHARLES JOHN WRIGHT. BRITTON BELL.

Witnesses D. LLOYD JONES, R. B. KERR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

